I sat down today and wrote a testcase to test the rendering quality of
-ms-text-combine-horizontal in IE11, which ships with Windows 8.1
Preview. Included in the post below are a set of screenshots showing
how IE11 renders tatechuyoko runs in a different situations.
http://lists.w3.org/Archives/Public/www-archive/2013Jul/0013.html
As with other existing implementations, the MS implementation makes
use of width variants. There are multiple problems here, but it's a
pre-release version so that's to be expected. The vertical spacing of
tatechuyoko runs is off, the placement of glyphs doesn't appear to be
centered, and the full-width glyph synthesis problem shows up in the
case of MS Mincho (which lacks width variants).
Cheers,
John Daggett